PSAT Math Multiple-Choice Practice Question 119
Question: 119
What is the value of 
if 10a = 13?
Correct Answer: B
Explanation:
B
The question asks for the value of an expression given an equation. Start by finding the value of a from the equation. Divide both sides by 10 to get a = 
. Next, substitute for a in the expression to get 
. Get a common denominator by multiplying 
by 
. The expression becomes 
. Subtract within the parentheses to get 
. Multiply to get 
or 4. The correct answer is (B).
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